sK1 2.0RC4 snapshot #20181109

Gtk3 becomes a default widgetset for popular Linux distros. So we improved Gtk3 backend support to provide usable sK1 application interface. The major problem was a SpinBox widget designed by Gtk3 developers as a widget for tablets. Such extra large control breaks application interface. Therefore we implemented custom SpinBox to resolve this issue. Here is sK1 screenshot on Ubuntu 18.04:

Also we have added Ubuntu 18.10 to our build stack and compiled package for this distro.